| 1 | THIS CODE IS DEPRECATED. |
| 2 | |
| 3 | Please use the new mainline SPI-GPIO driver, as of 2.6.29. |
| 4 | |
| 5 | --mb |
| 6 | |
| 7 | |
| 8 | |
| 9 | --- |
| 10 | drivers/spi/Kconfig | 9 + |
| 11 | drivers/spi/Makefile | 1 |
| 12 | drivers/spi/spi_gpio_old.c | 251 +++++++++++++++++++++++++++++++++++++++ |
| 13 | include/linux/spi/spi_gpio_old.h | 73 +++++++++++ |
| 14 | 4 files changed, 334 insertions(+) |
| 15 | |
| 16 | --- /dev/null |
| 17 | +++ b/include/linux/spi/spi_gpio_old.h |
| 18 | @@ -0,0 +1,73 @@ |
| 19 | +/* |
| 20 | + * spi_gpio interface to platform code |
| 21 | + * |
| 22 | + * Copyright (c) 2008 Piotr Skamruk |
| 23 | + * Copyright (c) 2008 Michael Buesch |
| 24 | + * |
| 25 | + * This program is free software; you can redistribute it and/or modify |
| 26 | + * it under the terms of the GNU General Public License version 2 as |
| 27 | + * published by the Free Software Foundation. |
| 28 | + */ |
| 29 | +#ifndef _LINUX_SPI_SPI_GPIO |
| 30 | +#define _LINUX_SPI_SPI_GPIO |
| 31 | + |
| 32 | +#include <linux/types.h> |
| 33 | +#include <linux/spi/spi.h> |
| 34 | + |
| 35 | + |
| 36 | +/** |
| 37 | + * struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device. |
| 38 | + * |
| 39 | + * This structure holds information about a GPIO-based SPI device. |
| 40 | + * |
| 41 | + * @pin_clk: The GPIO pin number of the CLOCK pin. |
| 42 | + * |
| 43 | + * @pin_miso: The GPIO pin number of the MISO pin. |
| 44 | + * |
| 45 | + * @pin_mosi: The GPIO pin number of the MOSI pin. |
| 46 | + * |
| 47 | + * @pin_cs: The GPIO pin number of the CHIPSELECT pin. |
| 48 | + * |
| 49 | + * @cs_activelow: If true, the chip is selected when the CS line is low. |
| 50 | + * |
| 51 | + * @no_spi_delay: If true, no delay is done in the lowlevel bitbanging. |
| 52 | + * Note that doing no delay is not standards compliant, |
| 53 | + * but it might be needed to speed up transfers on some |
| 54 | + * slow embedded machines. |
| 55 | + * |
| 56 | + * @boardinfo_setup: This callback is called after the |
| 57 | + * SPI master device was registered, but before the |
| 58 | + * device is registered. |
| 59 | + * @boardinfo_setup_data: Data argument passed to boardinfo_setup(). |
| 60 | + */ |
| 61 | +struct spi_gpio_platform_data { |
| 62 | + unsigned int pin_clk; |
| 63 | + unsigned int pin_miso; |
| 64 | + unsigned int pin_mosi; |
| 65 | + unsigned int pin_cs; |
| 66 | + bool cs_activelow; |
| 67 | + bool no_spi_delay; |
| 68 | + int (*boardinfo_setup)(struct spi_board_info *bi, |
| 69 | + struct spi_master *master, |
| 70 | + void *data); |
| 71 | + void *boardinfo_setup_data; |
| 72 | +}; |
| 73 | + |
| 74 | +/** |
| 75 | + * SPI_GPIO_PLATDEV_NAME - The platform device name string. |
| 76 | + * |
| 77 | + * The name string that has to be used for platform_device_alloc |
| 78 | + * when allocating a spi-gpio device. |
| 79 | + */ |
| 80 | +#define SPI_GPIO_PLATDEV_NAME "spi-gpio" |
| 81 | + |
| 82 | +/** |
| 83 | + * spi_gpio_next_id - Get another platform device ID number. |
| 84 | + * |
| 85 | + * This returns the next platform device ID number that has to be used |
| 86 | + * for platform_device_alloc. The ID is opaque and should not be used for |
| 87 | + * anything else. |
| 88 | + */ |
| 89 | +int spi_gpio_next_id(void); |
| 90 | + |
| 91 | +#endif /* _LINUX_SPI_SPI_GPIO */ |
| 92 | --- /dev/null |
| 93 | +++ b/drivers/spi/spi_gpio_old.c |
| 94 | @@ -0,0 +1,251 @@ |
| 95 | +/* |
| 96 | + * Bitbanging SPI bus driver using GPIO API |
| 97 | + * |
| 98 | + * Copyright (c) 2008 Piotr Skamruk |
| 99 | + * Copyright (c) 2008 Michael Buesch |
| 100 | + * |
| 101 | + * based on spi_s3c2410_gpio.c |
| 102 | + * Copyright (c) 2006 Ben Dooks |
| 103 | + * Copyright (c) 2006 Simtec Electronics |
| 104 | + * and on i2c-gpio.c |
| 105 | + * Copyright (C) 2007 Atmel Corporation |
| 106 | + * |
| 107 | + * This program is free software; you can redistribute it and/or modify |
| 108 | + * it under the terms of the GNU General Public License version 2 as |
| 109 | + * published by the Free Software Foundation. |
| 110 | + */ |
| 111 | + |
| 112 | +#include <linux/kernel.h> |
| 113 | +#include <linux/init.h> |
| 114 | +#include <linux/delay.h> |
| 115 | +#include <linux/spinlock.h> |
| 116 | +#include <linux/workqueue.h> |
| 117 | +#include <linux/module.h> |
| 118 | +#include <linux/platform_device.h> |
| 119 | +#include <linux/spi/spi.h> |
| 120 | +#include <linux/spi/spi_bitbang.h> |
| 121 | +#include <linux/spi/spi_gpio_old.h> |
| 122 | +#include <linux/gpio.h> |
| 123 | +#include <asm/atomic.h> |
| 124 | + |
| 125 | + |
| 126 | +struct spi_gpio { |
| 127 | + struct spi_bitbang bitbang; |
| 128 | + struct spi_gpio_platform_data *info; |
| 129 | + struct platform_device *pdev; |
| 130 | + struct spi_board_info bi; |
| 131 | +}; |
| 132 | + |
| 133 | + |
| 134 | +static inline struct spi_gpio *spidev_to_sg(struct spi_device *dev) |
| 135 | +{ |
| 136 | + return dev->controller_data; |
| 137 | +} |
| 138 | + |
| 139 | +static inline void setsck(struct spi_device *dev, int val) |
| 140 | +{ |
| 141 | + struct spi_gpio *sp = spidev_to_sg(dev); |
| 142 | + gpio_set_value(sp->info->pin_clk, val ? 1 : 0); |
| 143 | +} |
| 144 | + |
| 145 | +static inline void setmosi(struct spi_device *dev, int val) |
| 146 | +{ |
| 147 | + struct spi_gpio *sp = spidev_to_sg(dev); |
| 148 | + gpio_set_value(sp->info->pin_mosi, val ? 1 : 0); |
| 149 | +} |
| 150 | + |
| 151 | +static inline u32 getmiso(struct spi_device *dev) |
| 152 | +{ |
| 153 | + struct spi_gpio *sp = spidev_to_sg(dev); |
| 154 | + return gpio_get_value(sp->info->pin_miso) ? 1 : 0; |
| 155 | +} |
| 156 | + |
| 157 | +static inline void do_spidelay(struct spi_device *dev, unsigned nsecs) |
| 158 | +{ |
| 159 | + struct spi_gpio *sp = spidev_to_sg(dev); |
| 160 | + |
| 161 | + if (!sp->info->no_spi_delay) |
| 162 | + ndelay(nsecs); |
| 163 | +} |
| 164 | + |
| 165 | +#define spidelay(nsecs) do { \ |
| 166 | + /* Steal the spi_device pointer from our caller. \ |
| 167 | + * The bitbang-API should probably get fixed here... */ \ |
| 168 | + do_spidelay(spi, nsecs); \ |
| 169 | + } while (0) |
| 170 | + |
| 171 | +#define EXPAND_BITBANG_TXRX |
| 172 | +#include "spi-bitbang-txrx.h" |
| 173 | + |
| 174 | +static u32 spi_gpio_txrx_mode0(struct spi_device *spi, |
| 175 | + unsigned nsecs, u32 word, u8 bits) |
| 176 | +{ |
| 177 | + return bitbang_txrx_be_cpha0(spi, nsecs, 0, 0, word, bits); |
| 178 | +} |
| 179 | + |
| 180 | +static u32 spi_gpio_txrx_mode1(struct spi_device *spi, |
| 181 | + unsigned nsecs, u32 word, u8 bits) |
| 182 | +{ |
| 183 | + return bitbang_txrx_be_cpha1(spi, nsecs, 0, 0, word, bits); |
| 184 | +} |
| 185 | + |
| 186 | +static u32 spi_gpio_txrx_mode2(struct spi_device *spi, |
| 187 | + unsigned nsecs, u32 word, u8 bits) |
| 188 | +{ |
| 189 | + return bitbang_txrx_be_cpha0(spi, nsecs, 1, 0, word, bits); |
| 190 | +} |
| 191 | + |
| 192 | +static u32 spi_gpio_txrx_mode3(struct spi_device *spi, |
| 193 | + unsigned nsecs, u32 word, u8 bits) |
| 194 | +{ |
| 195 | + return bitbang_txrx_be_cpha1(spi, nsecs, 1, 0, word, bits); |
| 196 | +} |
| 197 | + |
| 198 | +static void spi_gpio_chipselect(struct spi_device *dev, int on) |
| 199 | +{ |
| 200 | + struct spi_gpio *sp = spidev_to_sg(dev); |
| 201 | + |
| 202 | + if (sp->info->cs_activelow) |
| 203 | + on = !on; |
| 204 | + gpio_set_value(sp->info->pin_cs, on ? 1 : 0); |
| 205 | +} |
| 206 | + |
| 207 | +static int spi_gpio_probe(struct platform_device *pdev) |
| 208 | +{ |
| 209 | + struct spi_master *master; |
| 210 | + struct spi_gpio_platform_data *pdata; |
| 211 | + struct spi_gpio *sp; |
| 212 | + struct spi_device *spidev; |
| 213 | + int err; |
| 214 | + |
| 215 | + pdata = pdev->dev.platform_data; |
| 216 | + if (!pdata) |
| 217 | + return -ENXIO; |
| 218 | + |
| 219 | + err = -ENOMEM; |
| 220 | + master = spi_alloc_master(&pdev->dev, sizeof(struct spi_gpio)); |
| 221 | + if (!master) |
| 222 | + goto err_alloc_master; |
| 223 | + |
| 224 | + sp = spi_master_get_devdata(master); |
| 225 | + platform_set_drvdata(pdev, sp); |
| 226 | + sp->info = pdata; |
| 227 | + |
| 228 | + err = gpio_request(pdata->pin_clk, "spi_clock"); |
| 229 | + if (err) |
| 230 | + goto err_request_clk; |
| 231 | + err = gpio_request(pdata->pin_mosi, "spi_mosi"); |
| 232 | + if (err) |
| 233 | + goto err_request_mosi; |
| 234 | + err = gpio_request(pdata->pin_miso, "spi_miso"); |
| 235 | + if (err) |
| 236 | + goto err_request_miso; |
| 237 | + err = gpio_request(pdata->pin_cs, "spi_cs"); |
| 238 | + if (err) |
| 239 | + goto err_request_cs; |
| 240 | + |
| 241 | + sp->bitbang.master = spi_master_get(master); |
| 242 | + sp->bitbang.master->bus_num = -1; |
| 243 | + sp->bitbang.master->num_chipselect = 1; |
| 244 | + sp->bitbang.chipselect = spi_gpio_chipselect; |
| 245 | + sp->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_mode0; |
| 246 | + sp->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_mode1; |
| 247 | + sp->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_mode2; |
| 248 | + sp->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_mode3; |
| 249 | + |
| 250 | + gpio_direction_output(pdata->pin_clk, 0); |
| 251 | + gpio_direction_output(pdata->pin_mosi, 0); |
| 252 | + gpio_direction_output(pdata->pin_cs, |
| 253 | + pdata->cs_activelow ? 1 : 0); |
| 254 | + gpio_direction_input(pdata->pin_miso); |
| 255 | + |
| 256 | + err = spi_bitbang_start(&sp->bitbang); |
| 257 | + if (err) |
| 258 | + goto err_no_bitbang; |
| 259 | + err = pdata->boardinfo_setup(&sp->bi, master, |
| 260 | + pdata->boardinfo_setup_data); |
| 261 | + if (err) |
| 262 | + goto err_bi_setup; |
| 263 | + sp->bi.controller_data = sp; |
| 264 | + spidev = spi_new_device(master, &sp->bi); |
| 265 | + if (!spidev) |
| 266 | + goto err_new_dev; |
| 267 | + |
| 268 | + return 0; |
| 269 | + |
| 270 | +err_new_dev: |
| 271 | +err_bi_setup: |
| 272 | + spi_bitbang_stop(&sp->bitbang); |
| 273 | +err_no_bitbang: |
| 274 | + spi_master_put(sp->bitbang.master); |
| 275 | + gpio_free(pdata->pin_cs); |
| 276 | +err_request_cs: |
| 277 | + gpio_free(pdata->pin_miso); |
| 278 | +err_request_miso: |
| 279 | + gpio_free(pdata->pin_mosi); |
| 280 | +err_request_mosi: |
| 281 | + gpio_free(pdata->pin_clk); |
| 282 | +err_request_clk: |
| 283 | + kfree(master); |
| 284 | + |
| 285 | +err_alloc_master: |
| 286 | + return err; |
| 287 | +} |
| 288 | + |
| 289 | +static int __devexit spi_gpio_remove(struct platform_device *pdev) |
| 290 | +{ |
| 291 | + struct spi_gpio *sp; |
| 292 | + struct spi_gpio_platform_data *pdata; |
| 293 | + |
| 294 | + pdata = pdev->dev.platform_data; |
| 295 | + sp = platform_get_drvdata(pdev); |
| 296 | + |
| 297 | + gpio_free(pdata->pin_clk); |
| 298 | + gpio_free(pdata->pin_mosi); |
| 299 | + gpio_free(pdata->pin_miso); |
| 300 | + gpio_free(pdata->pin_cs); |
| 301 | + spi_bitbang_stop(&sp->bitbang); |
| 302 | + spi_master_put(sp->bitbang.master); |
| 303 | + |
| 304 | + return 0; |
| 305 | +} |
| 306 | + |
| 307 | +static struct platform_driver spi_gpio_driver = { |
| 308 | + .driver = { |
| 309 | + .name = SPI_GPIO_PLATDEV_NAME, |
| 310 | + .owner = THIS_MODULE, |
| 311 | + }, |
| 312 | + .probe = spi_gpio_probe, |
| 313 | + .remove = __devexit_p(spi_gpio_remove), |
| 314 | +}; |
| 315 | + |
| 316 | +int spi_gpio_next_id(void) |
| 317 | +{ |
| 318 | + static atomic_t counter = ATOMIC_INIT(-1); |
| 319 | + |
| 320 | + return atomic_inc_return(&counter); |
| 321 | +} |
| 322 | +EXPORT_SYMBOL(spi_gpio_next_id); |
| 323 | + |
| 324 | +static int __init spi_gpio_init(void) |
| 325 | +{ |
| 326 | + int err; |
| 327 | + |
| 328 | + err = platform_driver_register(&spi_gpio_driver); |
| 329 | + if (err) |
| 330 | + printk(KERN_ERR "spi-gpio: register failed: %d\n", err); |
| 331 | + |
| 332 | + return err; |
| 333 | +} |
| 334 | +module_init(spi_gpio_init); |
| 335 | + |
| 336 | +static void __exit spi_gpio_exit(void) |
| 337 | +{ |
| 338 | + platform_driver_unregister(&spi_gpio_driver); |
| 339 | +} |
| 340 | +module_exit(spi_gpio_exit); |
| 341 | + |
| 342 | +MODULE_AUTHOR("Piot Skamruk <piotr.skamruk at gmail.com>"); |
| 343 | +MODULE_AUTHOR("Michael Buesch"); |
| 344 | +MODULE_DESCRIPTION("Platform independent GPIO bitbanging SPI driver"); |
| 345 | +MODULE_LICENSE("GPL v2"); |
| 346 | --- a/drivers/spi/Kconfig |
| 347 | +++ b/drivers/spi/Kconfig |
| 348 | @@ -170,6 +170,15 @@ config SPI_GPIO |
| 349 | GPIO operations, you should be able to leverage that for better |
| 350 | speed with a custom version of this driver; see the source code. |
| 351 | |
| 352 | +config SPI_GPIO_OLD |
| 353 | + tristate "Old GPIO API based bitbanging SPI controller (DEPRECATED)" |
| 354 | + depends on SPI_MASTER && GENERIC_GPIO |
| 355 | + select SPI_BITBANG |
| 356 | + help |
| 357 | + This code is deprecated. Please use the new mainline SPI-GPIO driver. |
| 358 | + |
| 359 | + If unsure, say N. |
| 360 | + |
| 361 | config SPI_IMX |
| 362 | tristate "Freescale i.MX SPI controllers" |
| 363 | depends on ARCH_MXC |
| 364 | --- a/drivers/spi/Makefile |
| 365 | +++ b/drivers/spi/Makefile |
| 366 | @@ -31,6 +31,7 @@ obj-$(CONFIG_SPI_FSL_LIB) += spi-fsl-li |
| 367 | obj-$(CONFIG_SPI_FSL_ESPI) += spi-fsl-espi.o |
| 368 | obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o |
| 369 | obj-$(CONFIG_SPI_GPIO) += spi-gpio.o |
| 370 | +obj-$(CONFIG_SPI_GPIO_OLD) += spi_gpio_old.o |
| 371 | obj-$(CONFIG_SPI_IMX) += spi-imx.o |
| 372 | obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o |
| 373 | obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o |
| 374 | |
